HariesDesign.com - To understand seo you need to be aware of the architecture of search engines. They all contain the following main components:
Spider - a browser-like program that downloads web pages.
Crawler - a program that automatically follows all of the links on each web page.
Indexer - a program that analyzes web pages downloaded by the spider and the crawler.
Database - storage for downloaded and processed pages.
Results engine - extracts search results from the database.
Web server - a server that is responsible for interaction between the user and other search engine components.
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